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CVE-2026-3129

LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes

6.4 Medium

CVE-2026-3129 is a medium vulnerability (CVSS 6.4) in Litespeedtech Litespeed Cache, published August 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.

What does this mean?
Severity
6.4 MediumCVSS 3.1, CVE List
Exploit chance
0.33%EPSS, 26th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.33%Up 0.1 points since Aug 28, 2026
90%50%10%1%

Affected products

What each source reports

CVE List Score used6.4

LiteSpeed Cache <= 7.7 - Authenticated (Author+) Stored Cross-Site Scripting via img Tag Attributes

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.

Record
CVE-2026-3129
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-674076.4

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.

Record
EUVD-2026-67407
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-g9h6-rmm3-xq5v6.4

The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via crafted...

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.

Record
GHSA-g9h6-rmm3-xq5v
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
NVD6.4

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.

Record
CVE-2026-3129
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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