CVE-2026-18978Disclosure

LOWCVSS 7.2 · HIGH

Signal is active with 3 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 7.8.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. A comment payload crafted exclusively from decimal numeric character references (e.g. ", <, >) placed inside an allowed element such as <code> bypasses WordPress's wp_kses sanitization, as kses does not treat a data-settings="..." substring within text content as an HTML attribute, allowing the malicious payload to reach the vulnerable function. For this to be exploitable, the site must allow users with previously approved comments to write new comments, and the require_name_email setting must be disabled.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
3 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 1 classified signal
General: 1 classified signal
3 total mentions across 1 day

Deep dive

Activity timeline3 mentions / 1d

Signal classification3 categories

Disclosure

133.3%

General

133.3%

Patch

133.3%

Referenced assets2 URLs

By indicator

Full discourse3 posts

Rıdvan Yağlı@ridvanyagli46d
Patch
🚨 LiteSpeed Cache for WordPress'te kritik Stored XSS açığı! CVE-2026-18978 olarak numaralandırılan açık, belirli WebP/AVIF yapılandırmalarında ve moderasyonsuz (onaysız) yorumların mümkün olduğu sitelerde kimlik doğrulaması gerektirmeden zararlı JavaScript enjeksiyonuna izin veriyor. CVE-2026-3129 ise belirli Media ayarları etkinleştirildiğinde Author veya üzeri yetkiye sahip saldırganların zararlı kod içeren bir gönderi oluşturarak Stored XSS gerçekleştirmesine neden olabiliyor. 🔴 Açığın ikisi de LiteSpeed Cache v7.9 sürümünde yamalandı. Etkilenen kullanıcıların v7.9 veya üzerine güncelleme yapması öneriliyor. Güncellenmesi gereken eklenti: https://wordpress.org/plugins/litespeed-cache/ Duyuru: https://blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-18978/
Post summary
The post announces that two stored XSS vulnerabilities (CVE‑2026‑18978 and CVE‑2026‑3129) have been patched in LiteSpeed Cache v7.9, recommending users update the plugin to mitigate the risks.
031851.7K
2.4K followersView on X
Kazım BİLİR@BilirKazim46d
Disclosure
🚨 LiteSpeed Cache for WordPress'te kritik Stored XSS açığı! CVE-2026-18978 olarak numaralandırılan açık, belirli WebP/AVIF yapılandırmalarında ve moderasyonsuz (onaysız) yorumların olduğu sitelerde kimlik doğrulaması gerektirmeden zararlı JavaScript enjeksiyonuna izin veriyor. https://t.co/TfbhTx19is
Post summary
This tweet announces a critical stored XSS vulnerability (CVE-2026-18978) in LiteSpeed Cache for WordPress, allowing unauthenticated JavaScript injection via specific WebP/AVIF configurations or unmoderated comment pages.
1000070
327 followersView on X
Kazım BİLİR@BilirKazim46d
General
Duyuru: https://blog.litespeedtech.com/2026/08/27/security-update-for-lscwp-cve-2026-18978/
Post summary
An announcement linking to a Litespeed blog post about CVE‑2026‑18978, with no further details about exploitation, mitigation or technical specifics in the provided text.
0000030
327 followersView on X

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