CVE-2026-103958
HIGH 8.3Server-side request forgery in the tool server and remote agent connection handling in Loom for AWS before 1.7.0 might allow an authenticated remote user to obtain the credentials of the application's own container role and to read responses from arbitrary internal network locations, via a crafted connection address supplied when registering, updating or testing a tool server or remote agent. To remediate this issue, users should upgrade to version 1.7.0 or later.
Severe if exploited (CVSS 8.3), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 28th percentile
Impact if exploited
8.3CVSS 4.0 · HIGH
- ConfidentialityHigh
- IntegrityNone
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires an admin / high-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-918: Server-side request forgery
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N
References and research data (JSON)
All CVSS metrics
- HIGH 7.6 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N - HIGH 8.3 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N - HIGH 8.3 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/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 - HIGH 7.6 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N
References
Patches & mitigations
- https://github.com/awslabs/loom/releases/tag/v1.7.0 CVE record · AMZN · Updated 2026-10-09T16:36:53.294Z
NVD · CVE-2026-103958 · Updated 2026-10-06T18:16:42.900
Advisories
- https://aws.amazon.com/security/security-bulletins/2026-124-aws/ CVE record · AMZN · Updated 2026-10-09T16:36:53.294Z
NVD · CVE-2026-103958 · Updated 2026-10-06T18:16:42.900 - https://github.com/awslabs/loom/security/advisories/GHSA-w6g6-h8pv-6mc7 CVE record · AMZN · Updated 2026-10-09T16:36:53.294Z
NVD · CVE-2026-103958 · Updated 2026-10-06T18:16:42.900 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-91773 EUVD · EUVD-2026-91773