# CVE-2026-127145: SOGo before 5.12.13 SSRF via Web Calendar Subscriptions

Status: published. Published: 2026-11-12. Updated: 2026-11-13.

SOGo before 5.12.13 contains a server-side request forgery vulnerability that allows authenticated users to make the server connect to arbitrary internal host:port destinations by supplying a user-controlled URL to the Calendar/addWebCalendar endpoint. Attackers can trigger a reload of the subscribed web calendar via the reload endpoint and distinguish response outcomes such as connection failures, timeouts, authentication prompts, or invalid content to probe the internal network from the server's position.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13

## Affected products and versions

- Alinto / sogo (Alinto/sogo): ≥ 0; < 5.12.13 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13 (CNA: VulnCheck; patch, release-notes)

- https://www.vulncheck.com/advisories/sogo-before-ssrf-via-web-calendar-subscriptions (CNA: VulnCheck; third-party-advisory)

- https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/sogo-before-ssrf-via-web-calendar-subscriptions (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127145; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-127145; retrieved 2026-11-12; source updated 2026-11-12

Revision: b583bae73f732503fe75c6a831e8186eb3aac31433532ae78f9978a726ffcf8b

Canonical: https://y2.dev/cve/CVE-2026-127145

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