CVE-2026-50883Public exploitNetwork attack vector

Stored HTML injection via unescaped long-line fallback

Published Jun 15, 2026 · Updated Jun 15, 2026

Stored HTML injection in matze wastebin 3.4.1 allows remote attackers to alter formatted paste pages through crafted long lines. In crates/wastebin_highlight/src/highlight.rs, the over-2048-character fallback returns each line without HTML escaping before the template treats it as trusted markup. Viewing the formatted paste exposes the injected page content; script execution depends on the browser and active content security policy.

CVSS severityUnavailable
Unscored
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored HTML injection in matze wastebin 3.4.1 allows remote attackers to alter formatted paste pages through crafted long lines. In crates/wastebin_highlight/src/highlight.rs, the over-2048-character fallback returns each line without HTML escaping before the template treats it as trusted markup. Viewing the formatted paste exposes the injected page content; script execution depends on the browser and active content security policy.

The record

CVE
CVE-2026-50883
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1189Drive-by Compromise

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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