Stored XSS via CKEditor long-text isolation failure
Published Feb 3, 2025 · Updated May 9, 2025
Stored XSS in Backdrop CMS 1.28.0 through 1.28.4 and 1.29.0 through 1.29.2 allows remote authenticated users to execute JavaScript. The CKEditor 5 integration loads stored long-text markup into its editing surface without isolating an attacker-supplied image event handler. The attacker needs permission to create long-text content through a node or comment form, and an administrator must edit rather than merely view it.
Summary
What happened
Stored XSS in Backdrop CMS 1.28.0 through 1.28.4 and 1.29.0 through 1.29.2 allows remote authenticated users to execute JavaScript. The CKEditor 5 integration loads stored long-text markup into its editing surface without isolating an attacker-supplied image event handler. The attacker needs permission to create long-text content through a node or comment form, and an administrator must edit rather than merely view it.
The record
- CVE
- CVE-2025-25062
- Published
- Feb 3, 2025
- Updated
- May 9, 2025
- Vendor
- Backdrop CMS
- Product
- Backdrop CMS
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 3, 2025CVE publishedPublication date reported by the CVE source.
- May 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.28.0 <1.28.5
- Affected versionversion=1.29.0 <1.29.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Backdrop CMS privilege escalation via stored XSS and CSRFfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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