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TI-2026-20871 Aliases CVE-2026-25808

Hollo DMs get leaked and can be seen on Webfinger Browser

Priority HIGH 72CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Prior to 0.6.20 and 0.7.2, there is a security vulnerability where DMs and followers-only posts were exposed through the ActivityPub outbox endpoint without authorization. This vulnerability is fixed in 0.6.20 and 0.7.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00489 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed hollo (fedify-dev): 0.7.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fedify-devhollo< 0.6.20, 0.7.2; 7.0.0 to before 0.7.20.7.2Patch availableCNA
  • hollo Vendorfedify-dev Affected < 0.6.20, 0.7.2; 7.0.0 to before 0.7.2 Fixed in 0.7.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:fedify:hollo:*:*:*:*:*:*:*:*0.6.0 to before 0.6.20; 0.7.0 to before 0.7.2Vulnerable@fedify
  • cpe:2.3:a:fedify:hollo:*:*:*:*:*:*:*:* Versions 0.6.0 to before 0.6.20; 0.7.0 to before 0.7.2 Vulnerable ·@fedify

Remediation

  • Fix · CNA hollo (fedify-dev) Fixed in 0.7.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25808

References

Exploit 1

Patch 1

Other 2

  • TI-2026-44926 Fedify: Server-Side Request Forgery in getNodeInfo() Allows Access to Internal Network Resources CVSS 4.0HIGH 8.8
  • TI-2025-34622 @fedify/fedify: Improper Authentication and Incorrect Authorization CVSS 4.0HIGH 8.7
  • TI-2026-36902 Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges CVSS 3.1HIGH 8.6
  • TI-2025-33806 Hollo renders posts received with form elements and allows submission CVSS 3.1MEDIUM 6.1
  • TI-2026-30750 Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring CVSS 3.1HIGH 7.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences