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TI-2026-74844 Aliases CVE-2026-62679

Path traversal in Lychee lets authenticated users read server files

Priority LOW 38CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Lychee before 7.6.4 has a path traversal flaw (CWE-22) in SecurePathController, which serves image requests. An authenticated user can submit encoded traversal segments that pass a string-prefix check, so the server resolves them to files outside the intended directory. An attacker can read files the web process can access, including application configuration and other users' private images.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Lychee is a free, open-source photo-management tool. Prior to 7.6.4, SecurePathController, which serves GET /image/{path}, concatenates the attacker-controlled path with the local storage root and performs a string-prefix check before canonicalizing dot segments. Under the supported non-default configuration with temporary_image_link_enabled enabled, temporary_image_link_when_logged_in disabled, and secure_image_link_enabled disabled, any authenticated user can submit encoded traversal segments that pass the prefix check and are later resolved by filesystem operations. This permits reading files available to the web process, including application configuration and other users' private images, and disclosed APP_KEY or database credentials can enable further compromise. This issue is fixed in version 7.6.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00353 29th percentileScored 2026-11-07
Fix Fixed Lychee (LycheeOrg): 7.6.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LycheeOrgLycheebefore 7.6.47.6.4Patch availableCNA
  • Lychee VendorLycheeOrg Affected before 7.6.4 Fixed in 7.6.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*——LycheeOrg
  • cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:* Versions — — ·LycheeOrg

Remediation

Upgrade Lychee to version 7.6.4, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Lychee (LycheeOrg) Fixed in 7.6.4

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-62679
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 CISA SSVC decision points changed

References

Other 4

  • TI-2026-74843 Album password bypass in Lychee ZIP downloads CVSS 4.0HIGH 8.2
  • TI-2026-74842 Missing rate limiting in Lychee album unlock allows password guessing CVSS 3.1HIGH 7.5
  • TI-2024-16953 Cross-site Request Forgery (CSRF) vulnerability in Lychee version 3.1.6, allows remote… CVSS 3.1HIGH 8.3
  • TI-2026-74848 Lychee webshop checkout lets buyers override payment amount CVSS 4.0HIGH 8.3
  • TI-2026-74845 Payment bypass in Lychee webshop through unrestricted Dummy gateway CVSS 4.0HIGH 8.3
  • TI-2026-74846 Uncontrolled resource consumption in Lychee PDF processing CVSS 4.0HIGH 7.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences