CVE-2026-91827Patch

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed plugin or theme, this can lead to actions such as arbitrary file operations or remote code execution.

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0.5/ 10 priority

Sources & remediation

Other references

https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/

Weakness type (CWE)

CWE-502

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

Patch or workaround signal is available
2 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 2 signals
Peaked 1d ago at 1 mentions (2026-09-22); latest day: 1
2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d

Signal classification1 categories

Patch

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters40d
Patch
CVE-2026-91827: PHP Object Injection in Ninja Forms 3.15.3, unpatched. CVSS 7.5, can lead to RCE. Disable or update now. https://www.valtersit.com/cve/CVE-2026-91827 #CVE #WordPress #infosec #NinjaForms #CVEALERT #CVE #infosec #Linux #XSS #valtersit #snippet #SysAdmin #cybersecurity #devsecops #devops #developer #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #cybersecurityawareness #cybersecuritynews #cybersecuritytips #python #hacker #kali #ubuntu #debian #docker
Post summary
Discloses CVE-2026-91827 in Ninja Forms 3.15.3 (unpatched, CVSS 7.5, RCE risk) with an explicit call to disable or update, linking to vendor details. No PoC, exploit tools, or active exploitation are mentioned.
0000053
1.1K followersView on X
Severity Daily@severitydaily46d
Patch
Ninja Forms deserializes an anonymous visitor's form value weeks later, when an admin exports to CSV. WPScan (@_wpscan_) calls it unauthenticated object injection. Fixed in 3.15.4. No exploitation reported. https://severitydaily.com/ninja-forms-cve-2026-91827-object-injection-csv-export-two-cnas-one-xss/
Post summary
The text discloses an unauthenticated object injection vulnerability in Ninja Forms (CVE-2026-91827) that is fixed in version 3.15.4, with no active exploitation reported.
0000023
26 followersView on X

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