Security readout for executives and security teams
Plain-English summary
Chatwoot before 2.6 allowed a high-privilege user to upload an SVG avatar containing stored JavaScript. If another user opened that avatar in a new page, the script could run in their browser, risking data exposure, limited tampering, or disruption.
Executive priority
Prioritize remediation for self-hosted Chatwoot below 2.6, particularly in environments with sensitive customer conversations. The privilege and interaction requirements reduce broad exploitation risk, but the potential confidentiality and availability impact is high.
Technical view
CVE-2021-3741 is CWE-79 stored XSS in chatwoot/chatwoot profile avatar handling. The supplied CVSS 3.0 score is 7.8 with AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:H. Sources identify all versions before 2.6 as affected and reference an upstream fix commit.
Likely exposure
Exposure is limited to organizations running Chatwoot versions earlier than 2.6, especially where high-privilege users can upload SVG profile avatars. The bundle does not provide CPEs or hosted-service exposure details.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires high privileges and user interaction, but successful stored XSS can affect users who later open the malicious avatar page.
Researcher notes
Evidence is concise but consistent: stored XSS via SVG avatar upload, fixed before or in 2.6, with one upstream commit reference. The bundle does not include exploit telemetry, detailed affected version ranges, or operational workaround confirmation.
Mitigation direction
- Upgrade Chatwoot to version 2.6 or later.
- Review Chatwoot vendor guidance and the referenced fix commit before backporting.
- Restrict high-privilege account access until patched.
- Review uploaded avatar content for unexpected SVG files.
Validation and detection
- Inventory Chatwoot deployments and confirm their exact versions.
- Flag any instance running a version earlier than 2.6.
- Confirm whether profile avatar uploads accept SVG files.
- Review user-uploaded avatar storage for suspicious SVG content.
- Check browser-side security reports for script execution from avatar pages.
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-79: 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 lookupCVE-2021-3741 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
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:H
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.
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:3.0/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:H1.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:H
Source materials
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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.