CVE-2026-81827 Flowintel Login Email Validation Bypass Allows Log Injection via Crafted Email Input
Unauthenticated attackers can inject log entries via crafted email input due to improper validation, potentially forging audit logs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81827?
CVE-2026-81827 is a medium-severity vulnerability in flowintel, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Affected versions of Flowintel incorrectly attempted to validate login email addresses by calling Email(email). That does not perform WTForms field validation; it merely constructs a validator object.
Consequently, malformed attacker-controlled email input could continue through the login process and be written to security-relevant logs. The vulnerable code inserted the supplied email into both a warning log and the custom audit logger. Since CR/LF characters were not escaped, an unauthenticated attacker could potentially inject additional physical log lines or forge misleading log entries.
The patch corrects the validation call to Email()(form, form.email), changes the standard logging call to parameterized logging, and introduces _sanitize_log_fragment() so carriage returns and line feeds are encoded instead of creating new records.
Version impacted >=3.3.0
Weakness: CWE-20
Which versions are affected by CVE-2026-81827?
How do I fix CVE-2026-81827?
No fix has been published for CVE-2026-81827 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81827 being exploited?
There is no known exploitation of CVE-2026-81827 in the wild and no public exploit code.
Sources
Also known as GHSA-3hq8-r684-4qwf.