CVE-2026-55779 json
Silverstripe Versioned: XSS in archive admin restore
published 2026-08-28 2 mo ago modified 2026-09-09 1 mo ago also GHSA-m4g4-86qc-v8w7 , EUVD-2026-68015
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
Silverstripe Versioned provides versioning for Silverstripe models. Prior to 3.2.1, RestoreAction::getRestoreMessage() in src/RestoreAction.php builds ArchiveAdmin restore notifications rendered as CAST_HTML and inserts $restoredItem->Title, $restoredItem->URLSegment, $restoredItem->CMSEditLink(), and $changedProperty['value'] without applying Convert::raw2xml(). When an administrator restores an archived page containing a crafted title or URL segment, the generated restoration message can execute stored JavaScript in the administrator's browser, compromising the confidentiality and integrity of the CMS session. This issue is fixed in version 3.2.1.
Patch / fix
- packagist silverstripe/versioned 3.2.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | silverstripe/versioned | <3.2.1 |
3.2.1 |
Affected products
- silverstripe silverstripe-versioned
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/silverstripe/silverstripe-versioned/pull/541
web
-
github.com
/silverstripe/silverstripe-versioned/commit/6e30a2cf8d4b9233690464da61bd0fc4d3e92952
web
-
github.com
/silverstripe/silverstripe-versioned/security/advisories/GHSA-m4g4-86qc-v8w7
web
-
github.com
/silverstripe/silverstripe-versioned/releases/tag/3.2.1
web
-
silverstripe.org
/download/security-releases/cve-2026-55779
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/silverstripe/versioned/CVE-2026-55779.yaml
web
-
github.com
/silverstripe/silverstripe-versioned
package
Sources
- CVE List CVE-2026-55779
- GitHub Advisory GHSA-m4g4-86qc-v8w7
- NVD CVE-2026-55779
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.