CVE-2026-49139 json
Nanobot < 0.2.1 SSRF via Microsoft Teams Channel serviceUrl Poisoning
published 5mo ago modified 3d ago also EUVD-2026-33759
- cvss
- 7.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
Nanobot prior to version 0.2.1 contains a server-side request forgery vulnerability in the Microsoft Teams channel handler that allows remote attackers to exfiltrate Bot Framework bearer tokens by supplying a forged activity with an attacker-controlled serviceUrl value. Attackers can poison the stored conversation reference by sending a crafted inbound activity to the Teams webhook, causing subsequent bot replies to transmit token-bearing Authorization header requests to an attacker-controlled host.
Patch / fix
- HKUDS nanobot 0.2.1
- github.com/HKUDS/nanobot@232df45 commit
- github.com/HKUDS/nanobot#4047 pull request
- github.com/HKUDS/nanobot/releases/tag/v0.2.1 release
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- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N |
| CNA | 4.0 | 7.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- HKUDS nanobot
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/HKUDS/nanobot/pull/4047
issue-tracking, patch
-
github.com
/HKUDS/nanobot/commit/232df45126bcf0f8fccd123d73714f202c8e8612
patch
-
github.com
/HKUDS/nanobot/releases/tag/v0.2.1
release-notes
-
vulncheck.com
/advisories/nanobot-ssrf-via-microsoft-teams-channel-serviceurl-poisoning
third-party-advisory
Sources
- CVE List CVE-2026-49139
- NVD CVE-2026-49139
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.