Private image disclosure via derivative access bypass
Published Aug 25, 2026 · Updated Aug 26, 2026
Information disclosure in Drupal core before 10.6.13 and affected Drupal 11 branches allows remote attackers to read private image derivatives. The Image module's derivative-serving path omits sufficient access checks when a private derivative uses a contributed file-stream scheme other than private://. Exposure requires a site to serve private derived images through a contributed non-core file scheme; disclosed impact is limited to reading those images.
Summary
What happened
Information disclosure in Drupal core before 10.6.13 and affected Drupal 11 branches allows remote attackers to read private image derivatives. The Image module's derivative-serving path omits sufficient access checks when a private derivative uses a contributed file-stream scheme other than private://. Exposure requires a site to serve private derived images through a contributed non-core file scheme; disclosed impact is limited to reading those images.
The record
- CVE
- CVE-2026-15916
- Published
- Aug 25, 2026
- Updated
- Aug 26, 2026
- Vendor
- OAuth.js
- Product
- Drupal core
- Classifications
- CWE-862, CAPEC-87
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 2026Record 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=0.0.0 <10.6.13
- Affected versionversion=0.0.0 <11.0.*
- Affected versionversion=0.0.0 <11.1.*
- Affected versionversion=0.0.0 <11.2.*
- Affected versionversion=11.3.0 <11.3.14
- Affected versionversion=11.4.0 <11.4.4
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.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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