Cross-Site Scripting (XSS) in LiteSpeed Cache (WordPress plugin) (CVE-2026-3129)
Summary
Cross-site scripting in LiteSpeed Cache (WordPress plugin) (CVE-2026-3129). Risk of unauthorized operations or information disclosure. Exploitable via width.
Original description
The description as published by the source.
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via crafted `` 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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-3129 has been found in LiteSpeed Cache (WordPress plugin).
Attackers can target a specific entry point like width over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.4/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "LiteSpeed Cache (WordPress plugin) CVE-2026-3129" on the vendor's site.
CVE-2026-3129 (LiteSpeed Cache (WordPress plugin)) — CWE-79 / CVSS v3 6.4
Attack vector: remote (network-reachable) / no user interaction
Attack surface: width / height
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in LiteSpeed Cache (WordPress plugin). Attackers reach the vulnerable code path via width.
Check the vendor advisory for the affected versions of LiteSpeed Cache (WordPress plugin). Attack surface: width / height.
Severity: Medium (CVSS 6.4/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで LiteSpeed Cache (WordPress plugin) を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。