Security readout for executives and security teams
Plain-English summary
CVE-2026-27812 affects Sub2API before version 0.1.85. A flaw in password reset link generation can let an attacker make reset emails point to an attacker-controlled domain. If a user follows the poisoned link, account takeover may be possible. The vendor has fixed this in v0.1.85.
Executive priority
Prioritize remediation for internet-facing or shared Sub2API deployments because successful abuse can lead to account takeover. Upgrade promptly, or disable forgot-password until upgraded.
Technical view
Sub2API trusts Host or Forwarded header data when building forgot-password links. In affected versions below 0.1.85, an unauthenticated network attacker can manipulate the generated reset URL domain. The advisory describes this as password reset poisoning leading to potential account takeover. CVSS 4.0 score is 8.0, high severity.
Likely exposure
Exposure is limited to organizations running Wei-Shaw Sub2API versions earlier than 0.1.85, especially where the forgot-password feature is enabled and reachable over the network.
Exploitation context
The source bundle does not report active exploitation, and this CVE is not listed as KEV. Exploitation depends on abusing reset-link generation and user interaction with a poisoned password reset flow.
Researcher notes
The public advisory identifies the issue as Host Header / Forwarded Header trust in password reset URL generation. Available sources name the fixed version and mitigation but do not provide evidence of exploitation in the wild.
Mitigation direction
- Upgrade Sub2API to version 0.1.85 or later.
- If immediate upgrade is not possible, disable the forgot-password feature.
- Track the GitHub security advisory for any updated vendor guidance.
Validation and detection
- Inventory Sub2API deployments and confirm installed versions.
- Verify whether the forgot-password feature is enabled on versions below 0.1.85.
- Review password reset emails for unexpected external domains if compromise is suspected.
- Confirm upgraded systems report Sub2API v0.1.85 or later.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-116: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27812 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Wei-Shaw/sub2api/security/advisories/GHSA-vc2q-289v-74g3CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Encoding or Escaping of Output
Improper Encoding or Escaping of Output represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.