Halo through 2.26.1 Open Redirect via Unvalidated URI Parameter
Priority MEDIUM 57CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.
Summary
Halo through 2.26.1 contains an open redirect vulnerability in the anonymous thumbnail endpoint that fails to validate the uri query parameter. Attackers can craft malicious links on the trusted Halo domain that redirect visitors to arbitrary external sites, enabling phishing attacks and abuse of redirect-based trust relationships.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-91772
- 2026-10-03 Alias added: GHSA-fvx2-w6cp-9mrg
References
Other 4
- https://github.com/halo-dev/halo/issues/10247
- https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/java/run/halo/app/core/endpoint/theme/ThumbnailEndpoint.java#L76-L98
- https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/resources/extensions/role-template-anonymous.yaml#L53-L55
- https://github.com/halo-dev/halo
More halo-dev vulnerabilities
- TI-2025-28627 halo v2.20.17 and before is vulnerable to server-side request forgery (SSRF) in… CVSS 3.1CRITICAL 9.1
- TI-2025-43155 An issue in halo v.2.22.4 and before allows a remote attacker to cause a denial of… CVSS 3.1HIGH 7.5
- TI-2026-63962 halo-dev Halo SpEL ReplyNotificationSubscriptionHelper.java neutralization CVSS 4.0MEDIUM 6.9
- TI-2024-29387 Halo's editor has a stored XSS vulnerability CVSS 3.1MEDIUM 6.4
- TI-2024-29386 Halo's editor has a stored Cross-Site Scripting vulnerability CVSS 3.1MEDIUM 6.3
- TI-2022-14503 Halo CMS v1.5.3 was discovered to contain an arbitrary file upload vulnerability via the… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-91772 · CVE Program
- CVE-2026-91772 · NVD
- FIRST EPSS
- GHSA-fvx2-w6cp-9mrg · GitHub Advisory Database · CC BY 4.0
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