CVE-2026-52873

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (27th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.9Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Streambert is a cross-platform Electron Desktop App to stream and download video content. From version 2.5.0 until version 2.6.0, the wyzie-open-redeem IPC handler in index.js creates the partition:wyzie-redeem Electron session and registers an onHeadersReceived hook that removes the Content-Security-Policy header from every response in that session. The redeem window also lacks a setWindowOpenHandler restriction, so script injection in sub.wyzie.io, a loaded third-party resource, or a site reached through navigation executes without CSP constraints and can affect additional windows and persistent session storage. A user must open the Wyzie API key redemption window, and exploitation requires attacker-controlled script content in a loaded page. The resulting renderer script can invoke renderer-exposed application functionality and can be chained with other vulnerabilities to access internal services or sensitive data. This issue is fixed in version 2.6.0.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity69% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
githubMentions a patch (unverified)🟡 PoC Available

Global CSP Removal in Wyzie Redeem Window Enables Unconstrained XSS in Electron Renderer · Advisory · truelockmc/streambert · GitHub

https://github.com/truelockmc/streambert/security/advisories/GHSA-2j2q-qvpf-wh43
github_release Patch Available

v.2.6.0

Patch available: truelockmc/streambert 2.6.0

https://github.com/truelockmc/streambert/releases/tag/2.6.0
github_pr Patch Available

Updated wyzie-subs handling & created a guide (similar to the tmdb-tutorial)

Patch available: truelockmc/streambert 2.6.0 (PR #126 merged 2026-06-02)

https://github.com/truelockmc/streambert/pull/126
github_commit Patch Available

commit 0bd6b6ca8c83 (truelockmc/streambert)

Patch available: truelockmc/streambert 2.6.0 (contains commit 0bd6b6ca8c83)

https://github.com/truelockmc/streambert/commit/0bd6b6ca8c830f22f75de1aa2e0d8b9bdf6d34c7

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-10 20:00 UTCEPSS rescore
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  1. 2026-09-26 00:27 UTCEPSS rescore
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  4. 2026-09-23 17:53 UTCEPSS rescore
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  8. 2026-09-20 20:16 UTCEPSS rescore
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  22. 2026-09-10 23:07 UTCEG score recompute
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  38. 2026-08-31 03:39 UTCEG score recompute
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  42. 2026-08-29 02:43 UTCEG score recompute
  43. 2026-08-28 21:41 UTCEPSS rescore
  44. 2026-08-27 23:10 UTCEG score recompute
  45. 2026-08-27 14:25 UTCEPSS rescore
  46. 2026-08-26 22:42 UTCEG score recompute
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  48. 2026-08-25 22:14 UTCEG score recompute
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  50. 2026-08-24 21:45 UTCEG score recompute
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  55. 2026-08-21 20:23 UTCEG score recompute
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  58. 2026-08-20 22:55 UTCEPSS rescore
  59. 2026-08-19 22:51 UTCEG score recompute
  60. 2026-08-19 17:04 UTCEPSS rescore
  61. 2026-08-18 22:23 UTCEG score recompute
  62. 2026-08-18 21:38 UTCEG score recompute
  63. 2026-08-18 21:38 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-52873?
CVE-2026-52873 is a medium vulnerability published on August 18, 2026. Streambert is a cross-platform Electron Desktop App to stream and download video content. From version 2.5.0 until version 2.6.0, the wyzie-open-redeem IPC handler in index.js creates the partition:wyzie-redeem Electron session and registers an onHeadersReceived hook that removes the…
When was CVE-2026-52873 disclosed?
CVE-2026-52873 was first published on August 18, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52873 actively exploited?
CVE-2026-52873 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52873?
CVE-2026-52873 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52873?
A fix for CVE-2026-52873 is available: update to the fixed version the vendor names in its advisory.

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