CVE-2026-4350Patch

LOWCVSS 8.1 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch affected systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

The Perfmatters plugin for WordPress is vulnerable to arbitrary file deletion via path traversal in all versions up to, and including, 2.5.9.1. This is due to the `PMCS::action_handler()` method processing the `$_GET['delete']` parameter without any sanitization, authorization check, or nonce verification. The unsanitized filename is concatenated with the storage directory path and passed to `unlink()`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server by using `../` path traversal sequences, including `wp-config.php` which would force WordPress into the installation wizard and allow full site takeover.

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2.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

DECLINING

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
9 mentions across 4 observed days
Momentum state: declining

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 5 signals
Technical details provided in 7 signals
Disclosure: 3 classified signals
Peaked 3d ago at 6 mentions (2026-04-03); latest day: 1
9 total mentions across 4 days

Deep dive

Activity timeline9 mentions / 4d

Signal classification3 categories

Patch

555.6%

Disclosure

333.3%

PoC

111.1%

Referenced assets6 URLs

By indicator

Classification over time

Date	Total	Labels

2026-04-03	6	Disclosure3Patch3
2026-04-04	1	Patch1
2026-04-07	1	PoC1
2026-04-10	1	Patch1

Full discourse9 posts

DFIR Radar@DFIR_Radar189d
Patch
Critical arbitrary file deletion flaw in Perfmatters WordPress plugin (CVE-2026-4350, CVSS 8.1) affects 200,000+ sites. Unauthenticated attackers can delete wp-config.php for full site takeover. Update to version 2.6.0 immediately. #DFIR_Radar https://t.co/u9743eyFvy
Post summary
A critical file-deletion flaw (CVE-2026-4350) in the Perfmatters WordPress plugin allows unauthenticated attackers to delete wp-config.php, enabling full site takeover; users are urged to update to v2.6.0 immediately.
10010147
1.2K followersView on X
kokumօtօ@__kokumoto189d
Patch
20万サイト以上が使用するWordPressのPerfmattersプラグインに深刻な脆弱性。CVE-2026-4350はCVSSスコア8.1（？？？）で、遠隔からサーバ上の任意のファイルを無認証で読み込み及び削除可能なもの。スニペット削除時のチェックが多数欠落しているのが悪い。2.6.0で修正。 https://securityonline.info/perfmatters-vulnerability-200k-sites-full-takeover-cve-2026-4350/
Post summary
CVE‑2026‑4350 exposes unauthenticated remote file read and delete in WordPress Perfmatters; the flaw was addressed in plugin version 2.6.0.
00011814
7.3K followersView on X
Argus Panoptes@Argus_pd181d
Patch
Signal cleanup: CVE-2026-4350 (Perfmatters) is real, but not every '200k sites at risk' post proves active mass exploitation. Patch fast, then verify exposure by version/auth path before reposting. Sources: NVD https://nvd.nist.gov/vuln/detail/CVE-2026-4350 + CISA KEV catalog
Post summary
The message confirms CVE‑2026‑4350 is legitimate, stresses the need to apply a patch rapidly, and clarifies there is no evidence of widespread active exploitation.
0000048
6 followersView on X
Atomic Edge@atomicedgeWAF184d
PoC
https://atomicedge.io/cve-proof/cve-2026-4350-perfmatters-version-2-5-9-1-high-vulnerability-proof-of-concept CVE-2026-4350 #WordPress plugin #vulnerability perfmatters #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge
Post summary
The text announces a proof of concept for CVE-2026-4350 impacting the Perfmatters plugin, indicating a high severity vulnerability but providing no details on exploit code, active exploitation, or patch availability.
0000037
6 followersView on X
StrongKeep Cybersecurity@StrongKeepCyber188d
Patch
WordPress plugin flaw puts 200k+ sites at risk. Perfmatters CVE-2026-4350 could allow full site takeover. If you run a small business site, check plugin updates, disable unused plugins, and review access rights. Read more: https://securityonline.info/perfmatters-vulnerability-200k-sites-full-takeover-cve-2026-4350/
Post summary
The article alerts that Perfmatters CVE‑2026‑4350 may enable full WordPress site takeover, and recommends updating or disabling the plugin and tightening access rights.
0000041
3 followersView on X
CVE@CVEnew188d
Disclosure
CVE-2026-4350 The Perfmatters plugin for WordPress is vulnerable to arbitrary file deletion via path traversal in all versions up to, and including, 2.5.9.1. This is due to the `PMCS… https://www.cve.org/CVERecord?id=CVE-2026-4350
Post summary
The Perfmatters WordPress plugin is vulnerable to path traversal that allows arbitrary file deletion in all versions up to 2.5.9.1.
0000042
56.9K followersView on X
CyberDudeBivash® | Global Cybersecurity Company@cyberbivash188d
Disclosure
🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-4350 - Perfmatters &lt;= 2.5.9.1 - Authenticated (Subscriber+) Arbitrary File Deletion via 'delete' Parameter Intel Report: https://ift.tt/snLqJXh
Post summary
Threat alert identifies CVE-2026-4350, allowing authenticated subscribers to delete arbitrary files through the 'delete' parameter in Perfmatters <= 2.5.9.1; no active exploitation or patch details are noted.
0000063
281 followersView on X
The Hacker Wire@TheHackerWire188d
Disclosure
🟠 CVE-2026-4350 - High The Perfmatters plugin for WordPress is vulnerable to arbitrary file deletion via path traversal in all versions up to, and including, 2.5.9.1. This is due to the `PMCS::action_handler()` meth... https://www.thehackerwire.com/vulnerability/CVE-2026-4350/ https://t.co/8iAGh8EMOS
Post summary
The post announces that Perfmatters plugin for WordPress is vulnerable to path traversal leading to arbitrary file deletion in all versions up to 2.5.9.1, with no mention of exploitation, patch, or PoC.
0000050
163 followersView on X
Gray Hats@the_yellow_fall189d
Patch
A critical 8.1 CVSS flaw in Perfmatters (200k+ installs) allows unauthenticated attackers to delete wp-config.php and hijack sites. Update to 2.6.0 now! #Perfmatters #WordPressSecurity #InfoSec #CyberSecurity #Vulnerability #CVE #WebSecurity #WordPress https://securityonline.info/perfmatters-vulnerability-200k-sites-full-takeover-cve-2026-4350/ https://t.co/uLgU99xMWM
Post summary
A high‑severity vulnerability (CVSS 8.1) in the Perfmatters WordPress plugin permits unauthenticated attackers to delete wp-config.php and take over sites; a patch (version 2.6.0) is recommended.
00000284
11.0K followersView on X

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What researchers are saying

CVE-2026-4350

DFIR Radar[verified]@DFIR_RadarPatch

A critical file-deletion flaw (CVE-2026-4350) in the Perfmatters WordPress plugin allows unauthenticated attackers to delete wp-config.php, enabling full site takeover; users are urged to update to v2.6.0 immediately.

kokumօtօ[verified]@__kokumotoPatch

CVE‑2026‑4350 exposes unauthenticated remote file read and delete in WordPress Perfmatters; the flaw was addressed in plugin version 2.6.0.

Argus Panoptes[verified]@Argus_pdPatch

The message confirms CVE‑2026‑4350 is legitimate, stresses the need to apply a patch rapidly, and clarifies there is no evidence of widespread active exploitation.

Atomic Edge@atomicedgeWAFPoC

The text announces a proof of concept for CVE-2026-4350 impacting the Perfmatters plugin, indicating a high severity vulnerability but providing no details on exploit code, active exploitation, or patch availability.

StrongKeep Cybersecurity@StrongKeepCyberPatch

The article alerts that Perfmatters CVE‑2026‑4350 may enable full WordPress site takeover, and recommends updating or disabling the plugin and tightening access rights.

CVE@CVEnewDisclosure

The Perfmatters WordPress plugin is vulnerable to path traversal that allows arbitrary file deletion in all versions up to 2.5.9.1.

CyberDudeBivash® | Global Cybersecurity Company@cyberbivashDisclosure

Threat alert identifies CVE-2026-4350, allowing authenticated subscribers to delete arbitrary files through the 'delete' parameter in Perfmatters <= 2.5.9.1; no active exploitation or patch details are noted.

The Hacker Wire@TheHackerWireDisclosure

The post announces that Perfmatters plugin for WordPress is vulnerable to path traversal leading to arbitrary file deletion in all versions up to 2.5.9.1, with no mention of exploitation, patch, or PoC.