CVE-2026-28481CWE-201

OpenClaw < 2026.2.1 - Bearer Token Leakage via MS Teams Attachment Downloader Suffix Matching

Medium · published March 5, 2026

CVSS v4.0
5.9
EPSS
0%
Percentile
40.7
In the wild
Unconfirmed
What it is

OpenClaw versions 2026.1.30 and earlier, contain an information disclosure vulnerability, patched in 2026.2.1, in the MS Teams attachment downloader (optional extension must be enabled) that leaks bearer tokens to allowlisted suffix domains. When retrying downloads after receiving 401 or 403 responses, the application sends Authorization bearer tokens to untrusted hosts matching the permissive suffix-based allowlist, enabling token theft.

The record
Technical detail
CVSS v4.0
5.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00484 · 40.7th percentile
Weakness
CWE-201 · Insertion of Sensitive Information Into Sent Data
Published
2026-03-05T21:59Z
EPSS history
Timeline
  • 05 MAR 21:59Z
    OpenClaw < 2026.2.1 - Bearer Token Leakage via MS Teams Attachment Downloader Suffix Matching
    cvelistv5