HOMEVULNERABILITIESCVE-2026-35628
MEDIUMPOC

CVE-2026-35628

CWE-307Published: April 9, 2026· Updated: Apr 15, 2026

6.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official Description

OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets. The vulnerability enables repeated authentication guesses without throttling, permitting attackers to systematically guess webhook secrets through brute-force attacks.

NVD Source

Technical Analysis

CVE-2026-35628 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A proof-of-concept (PoC) exploit exists for CVE-2026-35628. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

openclaw1 product
openclaw
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/openclaw/openclaw/commit/c2c136ae9517ddd0789d742a0fdf4c10e8c729a7
ADVISORYhttps://github.com/openclaw/openclaw/security/advisories/GHSA-vcx4-4qxg-mfp4
ADVISORYhttps://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-telegram-webhook-rate-limiting

All References (3)

→
https://github.com/openclaw/openclaw/commit/c2c136ae9517ddd0789d742a0fdf4c10e8c729a7Patch
→
https://github.com/openclaw/openclaw/security/advisories/GHSA-vcx4-4qxg-mfp4Vendor Advisory
→
https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-telegram-webhook-rate-limitingThird Party Advisory

Quick Facts

CVE IDCVE-2026-35628
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-307
CISA KEVNo
ExploitPOC
EPSS (30d)0.04%
Affected1 vendor
PublishedApr 9, 2026

Related CVEs (CWE-307)

CVE-2026-25113
9.8
CVE-2026-20792
9.8
CVE-2026-25114
9.8
CVE-2026-6853
9.8
CVE-2020-37228
9.8
CVE-2026-8760
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-35628 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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