CVE-2025-47278: Icloudpd · Flask uses fallback key instead of current signing key
Affects icloudpdSource GCVE Database
Not known to be exploited · CVSS 1.8 Low : upgrade to 1.28.1_1 when convenient.
Data as of 9 Nov 2026, 19:48 UTC
- Patch
- Available – fixed in 1.28.1_1
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 13 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Upgrade icloudpd to 1.28.1_1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Homebrewicloudpdpkg:brew/icloudpdOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available in icloudpd version 1.28.1_1 that fixes the fallback key handling issue. Users should upgrade to this fixed version to ensure correct session signing with the current key. No additional mitigation is required as sessions remain signed and integrity is maintained.
Description
CVE-2025-47278 is a low-severity vulnerability in Flask 3.1.0 affecting the icloudpd product versions >=1.25.1 and <1.28.1_1. The issue arises from incorrect handling of fallback key configuration for session signing, causing the last fallback key to be used instead of the current signing key. This impacts sites using key rotation via SECRET_KEY_FALLBACKS, leading to sessions being signed with stale keys, which may impede key transitions but does not compromise data integrity.
References
- github.com/pallets/flask/security/advisories/GHSA-4grg-w6v8-c28g (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2025-47278 (opens in a new tab)
- github.com/pallets/flask/commit/73d6504063bfa00666a92b07a28aaf906c532f09 (opens in a new tab)
- github.com/pallets/flask (opens in a new tab)
- github.com/pallets/flask/releases/tag/3.1.1 (opens in a new tab)