VulnSocial

CVE-2026-55778Disclosure

LOWCVSS 2.1 · LOW

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-434

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-06-19: 1Technical Details · 2026-06-19: 106-19
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
Full discourse1 post
  • DailyCVE@dailycve
    Disclosure

    🔵 Parse Server, Stored XSS via File Upload Extension Blocklist Bypass, #CVE-2026-55778 (Low) -DC-Jun2026-493 https://dailycve.com/parse-server-stored-xss-via-file-upload-extension-blocklist-bypass-cve-2026-55778-low-dc-jun2026-493/

    Post summary

    A low‑severity Stored XSS vulnerability in Parse Server (CVE‑2026‑55778) has been disclosed, detailing that it arises from a file upload extension blocklist bypass, but no PoC, exploit code, patch, or evidence of active exploitation is provided.

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    213 followersView on X

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