Authenticated directory access bypass via shared namespace
Published Sep 1, 2026 · Updated Sep 1, 2026
Incorrect authorization in Erlang/OTP inets httpd allows remote authenticated users to read protected content for other directories. The mod_auth dets and mnesia backends store every directory block's users and groups in shared tables, so a valid user for one block satisfies another block's access check. Exploitation requires one server instance with at least two differently restricted directory blocks and valid credentials for any protected path; plain authentication and single-directory configurations are unaffected.
Summary
What happened
Incorrect authorization in Erlang/OTP inets httpd allows remote authenticated users to read protected content for other directories. The mod_auth dets and mnesia backends store every directory block's users and groups in shared tables, so a valid user for one block satisfies another block's access check. Exploitation requires one server instance with at least two differently restricted directory blocks and valid credentials for any protected path; plain authentication and single-directory configurations are unaffected.
The record
- CVE
- CVE-2026-74994
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Erlang
- Product
- Erlang/OTP
- Classifications
- CWE-1289, CWE-863, CAPEC-122, CAPEC-114, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 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=17.0 <27.3.4.17
- Affected versionversion=28.0 <28.5.0.6
- Affected versionversion=29.0 <29.0.6
- Affected versionversion=5.10 <9.3.2.7
- Affected versionversion=84adefa331c4159d432d22840663c38f155cd4c1 <* changes=[{"at":"6982e381137ede21a4e1faf5fa2dd82321691176","status":"unaffected"},{"at":"c5ccec8ed25c70ec6557fd81277e4b2f52285c19","status":"unaffected"},{"at":"6101cb74ff2870718c622ba7af0c100f7f2524e3","status":"unaffected"}]
- Affected versionversion=9.4 <9.6.2.3
- Affected versionversion=9.7 <9.7.2
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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