Security readout for executives and security teams
Plain-English summary
This flaw could let a signed-in attacker abuse a Cisco Webex Teams username to make another user’s browser run unwanted script. The main business risk is theft or misuse of browser-accessible information inside Webex sessions. Cisco released updates, and the bundle says there are no workarounds.
Executive priority
Treat as a timely medium-priority patching item. It is not described as actively exploited, but it affects a collaboration platform where browser-accessible information can be sensitive. Ensure Cisco updates are applied and documented.
Technical view
CVE-2020-26067 is a CWE-80 cross-site scripting issue in the Cisco Webex Teams web interface. Usernames were not properly validated. An authenticated remote attacker could use malicious HTML or script content in an account name and join a space, potentially exposing sensitive browser-based information. CVSS 3.1 score is 5.4.
Likely exposure
Exposure is most relevant to organizations using the Cisco Webex Teams web-based interface. The source bundle names Cisco Webex Teams but does not provide affected version ranges, so teams must map exposure against Cisco’s advisory and installed service/client state.
Exploitation context
The bundle does not show known active exploitation, and KEV is false. Exploitation requires an authenticated remote attacker and user interaction. The attack path depends on a malicious account name appearing in a Webex Teams space.
Researcher notes
Evidence is limited to Cisco and CVE source data. The affected version field is not specified in the bundle. Validate impact through Cisco advisory details rather than assuming all Webex deployments are affected.
Mitigation direction
- Apply the Cisco software updates referenced in the advisory.
- Do not rely on a workaround; Cisco states none addresses this issue.
- Check Cisco guidance for the fixed release applicable to your deployment.
- Prioritize update validation for users handling sensitive Webex content.
Validation and detection
- Inventory Cisco Webex Teams web interface usage in the organization.
- Compare deployed versions or service state against Cisco advisory guidance.
- Confirm update completion through endpoint, service, or vendor management records.
- Review Webex spaces for suspicious account names if exposure is suspected.
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-80: 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-2020-26067 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/RL:X/RC:X/E:X
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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/RL:X/RC:X/E:X2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/RL:X/RC:X/E:X
Source materials
- CVE List V5 sourceCVE List V5
- cisco-sa-webex-teams-xss-zLW9tD3CVE reference
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 Script-Related HTML Tags in a Web Page (Basic XSS)
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.