Security readout for executives and security teams
Plain-English summary
Some Authlib-based identity servers can be tricked into redirecting users to an attacker-controlled website during an OIDC flow. This does not mean server takeover, but it can support phishing or token-flow confusion. The issue is fixed in Authlib 1.6.12 and 1.7.1.
Executive priority
Handle as a moderate-priority identity-platform fix. The main risk is user redirection abuse, commonly useful in phishing and trust-boundary attacks. Prioritize internet-facing authorization servers, especially where authentication flows protect customer, partner, or employee access.
Technical view
Affected Authlib versions mishandle OIDC implicit and hybrid authorization requests missing the openid scope. An unauthenticated remote attacker can cause the authorization endpoint to return an HTTP 302 to an attacker-chosen URL. CVSS is 6.1, with low complexity, user interaction required, changed scope, and low confidentiality/integrity impact.
Likely exposure
Exposure is likely limited to applications using Authlib to build OpenID Connect authorization servers with OpenIDImplicitGrant or OpenIDHybridGrant on versions below 1.6.12, or 1.7.0 before 1.7.1.
Exploitation context
Sources describe a remote unauthenticated open redirect requiring user interaction. The source bundle marks KEV as false and provides no evidence of active exploitation. Treat exploitation as plausible where vulnerable authorization endpoints are internet-reachable, but not confirmed by the provided evidence.
Researcher notes
The provided evidence names only Authlib and the OIDC implicit/hybrid grant authorization endpoint behavior. It does not establish broader OAuth grant impact, active exploitation, or additional mitigations beyond fixed versions. Avoid assuming all Authlib consumers are exposed without confirming grant usage.
Mitigation direction
- Upgrade affected Authlib branches to 1.6.12 or 1.7.1.
- Inventory services using Authlib as an OpenID Connect authorization server.
- Prioritize systems enabling OpenIDImplicitGrant or OpenIDHybridGrant.
- Review the Authlib advisory for any updated vendor guidance.
- Monitor authorization endpoints for suspicious redirect behavior.
Validation and detection
- Confirm deployed Authlib versions in application dependency manifests and runtime images.
- Identify whether OpenIDImplicitGrant or OpenIDHybridGrant is configured.
- Verify authorization endpoints are no longer on vulnerable Authlib versions.
- Review logs for unusual authorization requests and unexpected redirect destinations.
- Document affected services, owner, upgrade date, and residual exposure.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-601: 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 lookupCWE-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupCVE-2026-44681 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7GitHub_MVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2CVE reference, GitHub_M · 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.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.