CVE-2026-3129Disclosure

LOWCVSS 6.4 · MEDIUM

Signal is active with 2 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 crafted `<img>` tag attributes in all versions up to, and including, 7.7. This is due to a flawed regular expression that is used to strip `width` and `height` attributes from images when the "Lazy Load Images" and "Add Missing Sizes" features are enabled. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that execute whenever a user accesses an injected page.

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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
2 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
2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d

Signal classification2 categories

Disclosure

150.0%

Patch

150.0%

Referenced assets2 URLs

By indicator

Full discourse2 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 tweet announces two stored XSS vulnerabilities in LiteSpeed Cache for WordPress, provides technical details, and highlights that the issue is fixed in v7.9 with a recommendation to update.
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2.4K followersView on X
Kazım BİLİR@BilirKazim46d
Disclosure
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.
Post summary
CVE‑2026‑3129 allows attackers with Author or higher privileges to trigger a stored cross‑site scripting (XSS) attack by embedding malicious code into a post when specific media settings are active.
1000040
327 followersView on X

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