CVE-2026-62294
MEDIUMFlameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"
Title source: cnaDescription
Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/flameshot-org/flameshot/security/advisories/GHSA-fqqf-4rj8-c392
X_Refsource_Misc x_refsource_misc
https://github.com/flameshot-org/flameshot/pull/4716
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https://github.com/flameshot-org/flameshot/commit/936716b8d8b7052be461c3d5e2f88492b6eb3b96
X_Refsource_Misc x_refsource_misc
https://github.com/flameshot-org/flameshot/releases/tag/v14.0.0
Scores
CVSS v4
5.1
EPSS
0.0010
EPSS Percentile
1.1%
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/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
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-362
CWE-377
Status
published
Products (1)
flameshot-org/flameshot
< 14.0.0
Published
Jul 15, 2026
Tracked Since
Jul 15, 2026