CVE-2026-82657Public exploitNetwork attack vectorHinoki check available

Unauthenticated content disclosure via ungated RSS feeds

Published Aug 30, 2026 · Updated Aug 30, 2026

Authentication bypass in Admidio before 5.0.12 allows remote attackers to read login-only forum posts and announcements via RSS feeds. The rss/forum.php and rss/announcements.php endpoints reject only disabled modules, then emit content without enforcing login-only mode. Exposure requires RSS to be enabled, a module set to login-only, and a category without explicit view-role restrictions; it discloses titles, full text, author names, timestamps, and categories without changing data.

CVSS severity8.7
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in Admidio before 5.0.12 allows remote attackers to read login-only forum posts and announcements via RSS feeds. The rss/forum.php and rss/announcements.php endpoints reject only disabled modules, then emit content without enforcing login-only mode. Exposure requires RSS to be enabled, a module set to login-only, and a category without explicit view-role restrictions; it discloses titles, full text, author names, timestamps, and categories without changing data.

The record

CVE
CVE-2026-82657
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
Admidio
Product
Admidio
Classifications
CWE-200, CWE-306, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Admidio · Admidioversion=0 <5.0.12

Published CVSS scores

8.7VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-306Missing Authentication for Critical Function
T1213Data from Information Repositories

Public exploit references

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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo