Security readout for executives and security teams
Plain-English summary
CVE-2025-71388 lets a stoatchat user with simple read access retrieve webhook tokens for a channel. Those tokens can be used to post messages as a webhook, bypassing normal channel permissions. This creates impersonation and message-integrity risk, especially in trusted operational or community channels.
Executive priority
Treat as a high-priority patch for any production stoatchat instance with multiple trust levels. The business risk is unauthorized trusted-message posting, not full system compromise, but abuse could mislead users or disrupt operations.
Technical view
In stoatchat from 20241213-1 before 20250210-1, the webhook fetch endpoint authorized ViewChannel instead of ManageWebhooks. A low-privileged authenticated user could obtain webhook tokens and send arbitrary channel messages. The issue is mapped to CWE-639 and fixed in 20250210-1 / 0.8.2.
Likely exposure
Exposure is limited to organizations running affected stoatchat versions with channels where untrusted or lower-privileged users have ViewChannel access and webhooks exist. No CPEs are listed in the provided sources.
Exploitation context
The provided bundle does not show KEV listing or active exploitation. Exploitation requires authenticated channel read permission, but no user interaction. Impact is primarily unauthorized message injection, webhook impersonation, and disclosure of high-value webhook tokens.
Researcher notes
Evidence supports an authorization bypass in webhook retrieval, not remote unauthenticated compromise. The CVSS v4.0 score is 7.6 with PR:L, UI:N, and high confidentiality and integrity impact. Public evidence is limited to advisory, CVE data, third-party advisory, and patch reference.
Mitigation direction
- Upgrade stoatchat to 20250210-1 / 0.8.2 or later.
- Check the vendor advisory for any additional operational guidance.
- Review channels using webhooks with broad read access.
- Rotate or recreate webhook tokens if exposure is suspected and supported.
- Restrict channel read access for untrusted users until upgraded.
Validation and detection
- Inventory stoatchat deployments and confirm installed versions.
- Verify affected deployments are before 20250210-1 / 0.8.2.
- Review authorization logic for webhook listing against the vendor patch.
- Check logs for webhook enumeration by users without ManageWebhooks.
- Review unusual webhook-authored messages in sensitive channels.
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-639: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2025-71388 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
- High
- CVSS
- 7.6 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.6HighVector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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
- GitHub Security Advisory (GHSA-8684-rvfj-v3jq)CVE reference, VulnCheck · vendor-advisory
- https://github.com/stoatchat/stoatchat/commit/e3723d647effb81ea3d3919d848faf64dbe89829CVE reference, VulnCheck · patch
- VulnCheck Advisory: stoatchat 20241213-1 Webhook Token Disclosure via Read PermissionsCVE reference, VulnCheck · third-party-advisory
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.
Authorization Bypass Through User-Controlled Key
Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.