CVE-2026-33081Public exploitNetwork attack vector

Blind SSRF via browser-side redirect bypass

Published Mar 20, 2026 · Updated Mar 20, 2026

Blind SSRF in the /download endpoint in PinchTab before 0.8.3 allows remote attackers to reach internal services via crafted URLs. validateDownloadURL() checks only the initial URL, while embedded Chromium follows attacker-controlled redirects and resource requests without revalidating each destination. The endpoint is reachable only when security.allowDownload=true, which is disabled by default; responses remain blind, but requests can trigger state changes on internal-only services.

CVSS severity5.8
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SSRF in the /download endpoint in PinchTab before 0.8.3 allows remote attackers to reach internal services via crafted URLs. validateDownloadURL() checks only the initial URL, while embedded Chromium follows attacker-controlled redirects and resource requests without revalidating each destination. The endpoint is reachable only when security.allowDownload=true, which is disabled by default; responses remain blind, but requests can trigger state changes on internal-only services.

The record

CVE
CVE-2026-33081
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
PinchTab
Product
PinchTab
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PinchTab · PinchTabversion=< 0.8.3

Published CVSS scores

5.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
3.7NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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