CVE-2026-115333

Lotus through 0.10.2 contains an improper authentication vulnerability in the Go event ingestion middleware that validates API keys by prefix only, without checking the secret against the stored hashed_key. Attackers who know or obtain an API key prefix can submit usage events to POST /api/track/ as that organization, altering its metered usage and billing.

CVSS 4.0

8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-25)

CWE

CWE-287

Published

2026-10-22

Modified

2026-10-23

Record from

the NVD, synced 2026-10-23

References

• https://github.com/uselotus/lotus
• https://github.com/uselotus/lotus/blob/0.10.2/go/event-ingestion/authn/authn.go#L85-L95
• https://hackmd.io/@leediay/BkUc3WL2Mx
• https://www.vulncheck.com/advisories/lotus-through-0.10.2-improper-authentication-via-event-ingestion-api-key-prefix

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