Threat Intelligence / CVE / CVE-2026-74864

CVE-2026-74864 — YunoHost-Apps sogo_yhn

CVSS v4.0 9.3 (Critical, derived from score) · Priority 4.7/10 · Published 2026-09-30

As of 2026-09-30, CVE-2026-74864 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in YunoHost-Apps sogo_yhn, CVSS v4.0 9.3. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-74864, most recently “CVE-2026-74864 / CVE-2026-74865: Authentication bypass in YunoHost-Apps sogo_yhn (SOGo proxy-auth trust)”.

Last updated: 2026-09-30

What is CVE-2026-74864?

sogo_yhn configures SOGo with a parameter that forces the request with HTTP header "x-webobjects-remote-user" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password. This issue was fixed in version 5.8.0~ynh9.

The record classifies CVE-2026-74864 under weakness class CWE-639. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1 day ago.

Severity and exploitation probability

CVSS v4.0 base score
9.3 — Critical (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-30

Is CVE-2026-74864 being exploited?

No public exploitation evidence for CVE-2026-74864 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-09-30. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-74864

No vendor patch reference has been recorded for CVE-2026-74864 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-74864

1 tracked threat in the Threadlinqs corpus references CVE-2026-74864, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Third-party advisory

Issue tracking and product pages

Full detection coverage & IOCs for threats exploiting CVE-2026-74864 are available via the Threadlinqs MCP server (Purple tier). View plans →

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